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编辑同志: 建筑材料的质量优劣,直接关系到工程质量,关系到用户的切身利益。但是有相当一部分建筑材料,因质量、规格、品种存在问题,影响工程的质量和造价。有些地方产的水泥,安定性差,施工部门很不放心,不敢用于结构工程的重要部位和地面的抹面。有些砂石含有风化砂,石料中针片状含量较大,级配差,使混凝土多耗用水泥10%左右。有些石灰欠
Editor comrades: The quality of construction materials is directly related to the quality of the project and it is related to the immediate interests of users. However, there are a considerable number of construction materials, due to problems in quality, specifications, and varieties, affecting the quality and cost of the project. Cement produced in some places has poor stability and the construction department is not assured that they dare not use the important parts of structural engineering and the surface of the surface. Some gravels contain weathered sand. Stones contain large amounts of needles and poor grading. As a result, concrete consumes about 10% more cement. Some lime owes